CN110832676B - Device and method for cutting electrode slice - Google Patents
Device and method for cutting electrode slice Download PDFInfo
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- CN110832676B CN110832676B CN201880043574.3A CN201880043574A CN110832676B CN 110832676 B CN110832676 B CN 110832676B CN 201880043574 A CN201880043574 A CN 201880043574A CN 110832676 B CN110832676 B CN 110832676B
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- notch groove
- electrode sheet
- cutting
- line sensor
- notch
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/04—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member
- B26D1/06—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates
- B26D1/08—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates of the guillotine type
- B26D1/085—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates of the guillotine type for thin material, e.g. for sheets, strips or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D5/20—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed
- B26D5/30—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed having the cutting member controlled by scanning a record carrier
- B26D5/32—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed having the cutting member controlled by scanning a record carrier with the record carrier formed by the work itself
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D5/20—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed
- B26D5/30—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed having the cutting member controlled by scanning a record carrier
- B26D5/34—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting with interrelated action between the cutting member and work feed having the cutting member controlled by scanning a record carrier scanning being effected by a photosensitive device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/02—Perforating by punching, e.g. with relatively-reciprocating punch and bed
- B26F1/12—Perforating by punching, e.g. with relatively-reciprocating punch and bed to notch margins of work
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The apparatus for cutting an electrode sheet according to the present invention comprises: a transfer unit that transfers an electrode sheet having a plurality of notch grooves formed on a side surface thereof up to a cutting point via a measurement point such that, when a notch groove provided at a leading end among the notch grooves formed in the electrode sheet passes the cutting point, a notch groove provided at a trailing end of the notch groove of the leading end passes the measurement point; a detection unit disposed at the measurement point to detect a notch groove of the electrode sheet passing through the measurement point, thereby generating a notch groove detection signal; and a cutting unit disposed at the cutting point to cut the electrode sheet in which the notch groove passing through the cutting point is disposed, according to the notch groove detection signal generated by the detection unit.
Description
Technical Field
Cross Reference to Related Applications
This application claims the benefit of priority from korean patent application No. 10-2018-0051716, filed on 4.5.2018, which is hereby incorporated by reference in its entirety.
Technical Field
The present invention relates to an apparatus and method for cutting an electrode sheet, and more particularly, to an apparatus and method for cutting an electrode sheet by detecting a notch groove formed in the electrode sheet to improve cutting accuracy.
Background
Generally, a secondary battery (secondary battery) refers to a chargeable and dischargeable battery, unlike a non-chargeable primary battery. Secondary batteries are widely used in high-tech electronic fields such as mobile phones, notebook computers, and camcorders.
Such secondary batteries are classified into can type secondary batteries in which an electrode assembly is built in a metal can and pouch type secondary batteries in which an electrode assembly is built in a pouch. The pouch-type secondary battery includes an electrode assembly, an electrolyte, and a pouch accommodating the electrode assembly and the electrolyte. In addition, the electrode assembly has a structure in which a plurality of electrodes and a plurality of separators are alternately stacked.
The electrode is manufactured by cutting the long sheet-like electrode sheet at regular intervals by a cutting device. Here, the cutting device detects the electrode tabs formed on the electrode sheet, thereby cutting the electrode sheet at regular intervals.
However, in the cutting apparatus, when the electrode tab formed on the electrode sheet is deformed, for example, folded or lifted, the cutting time point of the electrode sheet is changed, thereby causing a problem that the electrode sheet is irregularly cut to manufacture a defective electrode.
Disclosure of Invention
Technical problem
The present invention has been made in an effort to solve the above problems, and an object of the present invention is to provide an apparatus and a method for cutting an electrode sheet, in which the electrode sheet is cut by detecting a notch groove formed in a length direction of the electrode sheet to constantly maintain a cutting time point of the electrode sheet, thereby improving cutting accuracy of the electrode sheet and preventing defective electrodes from being manufactured.
Technical scheme
In order to achieve the above object, an apparatus for cutting an electrode sheet according to a first embodiment of the present invention includes: a conveying unit that conveys an electrode sheet, which is formed with a plurality of notch grooves on a side surface thereof, up to a cutting point via a measurement point such that, when a notch groove provided at a leading end among the notch grooves formed in the electrode sheet passes the cutting point, a notch groove provided at a trailing end of the notch groove at the leading end passes the measurement point; a detection unit provided at the measurement point to detect a notch groove of the electrode sheet passing through the measurement point, thereby generating a notch groove detection signal; and a cutting unit disposed at the cutting point to cut the electrode sheet in which the notch groove passing through the cutting point is disposed according to the notch groove detection signal generated by the detection unit.
The detection unit may include a line sensor installed in a direction perpendicular to a conveying direction of the electrode sheet to detect a notch groove of the electrode sheet passing through the measurement point to generate the notch groove detection signal, wherein the line sensor may include a plurality of light receiving elements, and the plurality of light receiving elements detect the notch groove by a change in transmittance occurring when the notch groove of the electrode sheet passes through the measurement point.
The notch groove may include a first notch groove and a second notch groove facing each other formed at both side surfaces of the electrode pad, respectively, and the line sensor may include a first line sensor and a second line sensor to detect the first notch groove and the second notch groove.
The line sensor may generate the notch groove detection signal even if any one of the first notch groove and the second notch groove is detected by the first line sensor and the second line sensor.
When both the first notch groove and the second notch groove are detected by the first line sensor and the second line sensor, the line sensor may generate the notch groove detection signal according to an average of a time point at which the first notch groove is detected and a time point at which the second notch groove is detected.
The line sensor may generate a notch groove defect signal when the first notch groove and the second notch groove are not detected by neither the first line sensor nor the second line sensor.
An electrode tab may be provided on one side surface of the electrode sheet where the first notch groove is formed, and the first line sensor detecting the first notch groove may further detect whether the electrode tab is defective or not by a change in transmittance occurring when the electrode tab passes.
A method of cutting an electrode sheet according to a first embodiment of the present invention includes: a step (a) of continuously conveying an electrode sheet having a plurality of notch grooves formed in a side surface thereof to a cutting point via a measuring point by a conveying unit so that a notch groove provided at a rear end of a notch groove provided at a front end passes the measuring point when the notch groove provided at the front end among the notch grooves formed in the electrode sheet passes the cutting point; detecting a notch groove of the electrode sheet passing through the measuring point, thereby generating a notch groove detection signal; and (c) cutting the electrode sheet, in which the notch groove passing through the cutting point is disposed, with a cutting unit to manufacture a unit electrode, when the notch groove detection signal is generated.
The step (b) may further comprise the steps of: with the detection unit, whether the electrode tab provided on one side surface of the electrode tab is defective is detected by a change in transmittance occurring when the electrode tab passes.
In an apparatus for cutting an electrode sheet according to another embodiment of the present invention, a detecting unit is installed at a measuring point, and the apparatus further includes an adjusting unit installed to be movable in a direction perpendicular to a conveying direction of the electrode sheet such that a position of the detecting unit is adjusted to correspond to a notch groove passing through the measuring point.
Advantageous effects
Firstly, the method comprises the following steps: the cutting apparatus of the present invention may include a transfer unit, a detection unit, and a cutting unit. The detection unit may detect a notch groove formed at a side surface of the electrode sheet to generate a notch groove detection signal, and the cutting unit may cut the electrode sheet according to the notch groove detection signal generated by the detection unit. Thus, the cutting time point of the electrode sheet can be more accurately detected to improve the cutting accuracy of the electrode sheet, thereby preventing defective electrodes from being manufactured.
Secondly, the method comprises the following steps: the detection unit of the present invention may include a line sensor that detects the notch groove by a change in transmittance occurring when the notch groove of the electrode sheet passes, to more accurately detect the notch groove, thereby more accurately detecting the cutting time point of the electrode sheet.
Thirdly, the method comprises the following steps: the notch groove of the present invention may include a first notch groove and a second notch groove facing each other and respectively formed at both side surfaces of the electrode sheet. The line sensor may include a first line sensor and a second line sensor to detect the first notch groove and the second notch groove, thereby improving sensitivity to the notch grooves.
Fourthly: the line sensor of the present invention can generate a notch groove detection signal even if any one of the first and second notch grooves is detected by the first and second line sensors, thereby preventing an accident in advance from occurring due to the notch groove not being detected.
Fifth, the method comprises the following steps: when both the first notch groove and the second notch groove are detected by the first line sensor and the second line sensor, the line sensor of the present invention generates the notch groove detection signal according to an average value of a time point at which the first notch groove is detected and a time point at which the second notch groove is detected. Thus, the cutting time point of the electrode sheet can be uniformly controlled to manufacture an electrode having uniform quality.
The line sensor of the present invention determines that the state is normal when a point of time at which the first notch groove is detected and a point of time at which the second notch groove is detected are within a set time, and determines that the state is a skew fault when the point of time exceeds the set time, and thus the conveyance of the conveyance unit may be stopped.
Sixth: the line sensor of the present invention may generate a notch groove defect signal to prevent a defective electrode sheet from being cut continuously in advance when the first and second notch grooves are not detected by both the first and second line sensors.
Seventh: the line sensor of the present invention may detect the electrode tab disposed on one side surface of the electrode tab by the first line sensor detecting the first notch groove, and the first line sensor may detect whether the electrode tab is defective by a change in transmittance occurring when the electrode tab passes. Thus, whether the electrode tab is deformed or not can be easily detected, and a quality test of the electrode tab can also be performed without a separate additional sensor.
Drawings
Fig. 1 is a sectional view of an apparatus for cutting an electrode sheet according to a first embodiment of the present invention.
Fig. 2 is a schematic plan view of an apparatus for cutting an electrode sheet according to a first embodiment of the present invention.
Fig. 3 is a plan view illustrating a line sensor of an apparatus for cutting an electrode sheet according to a first embodiment of the present invention.
Fig. 4 is a flowchart illustrating a method of cutting an electrode sheet according to a first embodiment of the present invention.
Fig. 5 is a perspective view of an apparatus for cutting an electrode sheet according to a second embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in a manner that the technical idea of the present invention can be easily implemented by those of ordinary skill in the art to which the present invention pertains. This invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, any unnecessary description of the invention will be omitted for clarity, and like reference numerals denote like elements in the drawings.
[ electrode slice ]
Referring to fig. 1, an electrode sheet 10 according to a first embodiment of the present invention includes a long sheet-shaped current collector and electrode active material layers applied to both surfaces of the current collector. Further, electrode tabs 12 are formed on one side surface (right side surface as viewed in fig. 1) of the current collector, and notch grooves 11 for identifying cut portions of the electrode sheet 10 are formed between the electrode tabs 12. The notch groove 11 includes a first notch groove 11a and a second notch groove 11b facing each other and respectively formed at both side surfaces of the electrode sheet 10.
Further, a plurality of first and second notch grooves 11a and 11b are provided along the length direction of the electrode sheet 10. In particular, the plurality of first notch grooves 11a and the plurality of second notch grooves 11b are formed at regular intervals in the length direction of the electrode sheet 10 and have a triangular shape to accurately indicate the cutting position.
The electrode sheet 10 having the above-described structure may be cut at a position where the notch groove 11 is provided, thereby being manufactured as the unit electrode 1. Here, the electrode sheet 10 is cut by an apparatus for cutting the electrode sheet.
That is, the apparatus for cutting the electrode sheet may cut the electrode sheet 10 by detecting the notch groove 11 formed in the electrode sheet 10 to improve cutting accuracy, thereby continuously manufacturing the unit electrodes 1 having uniform quality.
[ apparatus for cutting electrode sheet according to first embodiment ]
For example, as shown in fig. 1, an apparatus 100 for cutting an electrode sheet according to a first embodiment of the present invention is an apparatus for cutting an electrode sheet by detecting a notch groove formed at a side surface of the electrode sheet, and the apparatus 100 for cutting an electrode sheet includes: a conveying unit 110, the conveying unit 110 being for conveying the electrode sheet 10 in which a plurality of notch grooves 11 are formed at regular intervals on a side surface; a detecting unit 120, the detecting unit 120 detecting the notch groove 11 formed in the electrode sheet 10 conveyed by the conveying unit 110; and a cutting unit 130, the cutting unit 130 cutting the electrode sheet 10 when the detecting unit 120 detects the notch groove 11 to manufacture the unit electrode 1.
Transfer unit
Referring to fig. 1, the transfer unit 110 transfers the electrode sheet 10 formed with the notch grooves 11 up to the cutting point B via the measurement point a. Here, the transfer unit 110 transfers the electrode sheet 10 such that, when a notch groove (hereinafter, referred to as a front notch groove 11B) disposed at a front end among the notch grooves 11 formed in the electrode sheet 10 passes through the cutting point B, a notch groove (hereinafter, referred to as a rear notch groove 11A) disposed at a rear end of the front notch groove 1B passes through the measurement point a.
Here, the transfer unit 110 includes a transfer belt that transfers the electrode sheet 10 such that the notch grooves 11 formed at the side surface of the electrode sheet 10 at regular intervals sequentially pass through the measurement point a to be transferred up to the cutting point B. The conveyor belts are provided in pairs to simultaneously support and convey both surfaces of the electrode sheet 10.
Detection unit
The detection unit 120 detects the notch groove of the electrode sheet passing through the measurement point a to generate a notch groove detection signal, and the detection unit 120 includes a detection body 121 disposed at the measurement point a and a line sensor 122 fixed to the detection body 121 to detect the notch groove 11 of the electrode sheet 10 passing through the measurement point a to generate a notch groove detection signal.
Here, the line sensor 122 is installed in a direction perpendicular to the conveying direction of the electrode sheet 10 to detect the notch groove 11 of the electrode sheet 10 passing through the measurement point a, thereby generating a notch groove detection signal.
In more detail, the line sensor 122 includes a plurality of light receiving elements 122 c. The plurality of light receiving elements 122c detect the notch groove 11 by a change in transmittance occurring when the notch groove 11 of the electrode sheet 10 passes the measurement point a.
That is, referring to fig. 2 and 3, in the line sensor 122, a plurality of light receiving elements 122c are mounted to be connected to each other in a direction perpendicular to the conveying direction of the electrode sheet 10, and when light is irradiated toward the electrode sheet 10, the light has a predetermined transmittance. Here, when the notch groove 11 formed in the electrode sheet 10 passes through the measurement point a, transmittance of light irradiated toward the electrode sheet 10 changes. Here, the notch groove 11 of the electrode sheet 10 can be detected by calculating a change in transmittance.
In particular, the line sensor 122 includes a first line sensor 122a and a second line sensor 122b that detect a first notch groove 11a and a second notch groove 11b respectively formed at both side surfaces of the electrode sheet 10 facing each other. The line sensor 122 including the first line sensor 122a and the second line sensor 122b may be provided as follows.
Firstly, the method comprises the following steps: the line sensor 122 can generate a notch groove detection signal even if any one of the first notch groove 11a and the second notch groove 11b is detected by the first line sensor 122a and the second line sensor 122 b. That is, even if any one of the first and second notch grooves 11a and 11b is detected by the first and second line sensors 122a and 122b, the line sensor 122 may generate a notch groove detection signal by determining the detected notch groove as a cut point. Thus, even if a problem occurs in any one of the first and second line sensors 122a and 122b or in any one of the first and second notch grooves 11a and 11b, a notch groove detection signal can be generated to improve the continuity of the cutting operation.
In particular, the line sensor 122 includes a first line sensor 122a and a second line sensor 122 b. Thus, when only any one of the first notch groove 11a and the second notch groove 11b is detected, a notch groove detection signal can be generated, while a defect signal can be generated for an undetected notch groove. Therefore, it is possible to control such that the electrode tab having the notch groove, which generates the defect signal, is not included in the manufacturing process of the electrode assembly.
Secondly, the method comprises the following steps: when both the first and second notch grooves 11a and 11b are detected by the first and second line sensors 122a and 122b, the line sensor 122 generates a notch groove detection signal according to an average value of a time point at which the first notch groove 11a is detected and a time point at which the second notch groove 11b is detected.
Here, when the average value of the time point at which the first notch groove 11a is detected and the time point at which the second notch groove 11b is detected is within the set value, the line sensor 122 determines that this state is normal, thereby generating the notch groove detection signal. When the average value of the time point at which the first notch groove 11a is detected and the time point at which the second notch groove 11b is detected exceeds a set value, the line sensor 122 determines that this state is abnormal, thereby generating a defect signal, and at the same time, generates a signal for stopping the conveying unit 110 so that the electrode sheet 10 is not conveyed.
The set value may be set to a value of 2.0mm or less, preferably, 1.0mm or less. That is, when the set value is set to a value of 2.0mm or more, a cut surface having a 'v' -shaped groove is formed at one side of the unit electrode while a portion spaced apart by at least 1mm from the apex of each of the first and second notch grooves 11a and 11b is cut. In particular, the front end of the 'v' -shaped groove protrudes outward by 1mm or more, and thus is classified as a defective cell electrode.
Thus, when the set value is set to 2.0mm or less, even if a 'v' groove is formed in one cut surface of the cut unit electrode, the one cut surface of the cut unit electrode is formed to a size of 1mm or less. Thus, the cut unit electrodes are classified as normal unit electrodes.
Thirdly, the method comprises the following steps: when the first and second notch grooves 11a and 11b are not detected by both the first and second line sensors 122a and 122b, the line sensor 122 determines that a defect occurs in the electrode sheet 10 conveyed by the conveying unit 110, thereby generating a notch groove defect signal, and immediately generates a stop signal to the conveying unit 110 so that the electrode sheet 10 is not conveyed.
As described above, the detection unit 120 may use the line sensor 122. Thus, the detection unit 12 may detect the notch groove 11 formed in the electrode sheet 10 and also generate a notch groove detection signal to accurately determine the cutting time point of the electrode sheet 10.
The first line sensor 122a detecting the first notch groove 11a may also detect whether the electrode tab 12 formed on the electrode tab 10 is defective or not by a change in transmittance occurring when the electrode tab 12 passes. That is, the first line sensor 122a may detect a predetermined transmittance when the electrode tab 12 formed on the electrode sheet 10 passes. Here, when a part or the whole of the electrode tab 12 is folded or cut, irregular variation in transmittance may occur. Here, the first line sensor 122a may detect the irregular change, thereby determining whether the electrode tab is defective. Accordingly, it is possible to confirm whether the electrode tab is defective without a separate additional detection sensor.
Cutting unit
The cutting unit 130 may be disposed at the cutting point B to cut the electrode sheet 10 in which the notch groove passing through the cutting point B is disposed according to the notch groove detection signal generated by the detection unit 120. Thus, the unit electrode 1 can be obtained.
That is, when the detecting unit 120 detects the notch groove 11 passing through the measuring point a, the cutting unit 130 cuts the electrode sheet 10 in which the notch groove 11 passing through the cutting point B is disposed.
In the apparatus 100 for cutting an electrode sheet according to the first embodiment of the present invention having the above-described configuration, the electrode sheet 10 may be cut by detecting the notch groove 11 formed in the electrode sheet 10. Thus, the cutting time point of the electrode sheet may be precisely detected to precisely cut the electrode sheet, thereby obtaining a unit electrode having uniform quality.
[ method of cutting an electrode sheet according to the first embodiment ]
Hereinafter, a method of cutting an electrode sheet using the apparatus 100 for cutting an electrode sheet according to the first embodiment of the present invention will be described.
As shown in fig. 4, the method of cutting an electrode sheet according to the first embodiment includes: a step (a) of continuously conveying an electrode sheet 10, in which a plurality of notch grooves 11 are formed at regular intervals on a side surface thereof, all the way to a cutting point B via a measurement point a; detecting a notch groove 11 of the electrode sheet 10 passing through the measurement point a to generate a notch groove detection signal; and a step (c) of cutting the electrode sheet 10, in which the notch groove 11 passing through the cutting point B is disposed, to manufacture the unit electrode 1, when the notch groove detection signal is generated.
In step (a), the electrode sheet 10 in which a plurality of notch grooves 11 are formed at regular intervals on the side surface thereof may be continuously conveyed to the cutting point B via the measurement point a by the conveying unit 110. Here, in step (a), the electrode sheet 10 is conveyed such that when a front notch groove 11B provided at a front end among the notch grooves 11 formed in the electrode sheet 10 passes through the cutting point B, a rear notch groove 11A provided at a rear end of the front notch groove 11B passes through the measuring point.
In step (b), the detection unit 120 detects the notch groove 11 of the electrode sheet 10 passing through the measurement point a, thereby generating a notch groove detection signal.
Here, the detecting part 120 includes a line sensor 122 installed in a direction perpendicular to the conveying direction of the electrode sheet 10 to detect the notch groove 11 of the electrode sheet 10 passing through the measuring point a, thereby generating a notch groove detection signal. The line sensor 122 includes a plurality of light receiving elements 122 c. The plurality of light receiving elements 122c detect the notch groove 11 by a change in transmittance occurring when the notch groove 11 of the electrode sheet 10 passes the measurement point a.
Here, the line sensor 122 includes a first line sensor 122a and a second line sensor 122b that detect a first notch groove 11a and a second notch groove 11b respectively formed at both side surfaces of the electrode sheet 10 to generate notch groove detection signals.
For example, even if any one of the first and second notch grooves 11a and 11b is detected by the first and second line sensors 122a and 122b, the line sensor 122 may generate a notch groove detection signal. That is, even if any one of the first and second notch grooves 11a and 11b is detected by the first and second line sensors 122a and 122b, the line sensor 122 may generate a notch groove detection signal by determining the detected notch groove as a cut point.
When both the first and second notch grooves 11a and 11b are detected by the first and second line sensors 122a and 122b, the line sensor 122 generates a notch groove detection signal according to an average value of a time point at which the first notch groove 11a is detected and a time point at which the second notch groove 11b is detected.
When the first and second notch grooves 11a and 11b are not detected by both the first and second line sensors 122a and 122b, the line sensor 122 determines that a defect occurs in the electrode sheet 10 conveyed by the conveying unit 110, thereby generating a notch defect signal, and immediately stops the conveying unit 110, so that the conveyance of the electrode sheet 10 is stopped.
Step (b) further comprises the steps of: with the detection unit, whether the electrode tab is defective is detected by a change in transmittance occurring when the electrode tab disposed on one side surface of the electrode tab passes.
In step (c), when the notch groove detection signal is generated, the electrode sheet 10 in which the notch groove 11 passing through the cutting point B is disposed is cut by the cutting unit 130 to manufacture the unit electrode 1.
As described above, the unit electrodes 1 having uniform quality can be continuously manufactured by the method of cutting an electrode sheet according to the first embodiment of the present invention.
Hereinafter, in the description of another embodiment of the present invention, the constituent elements having the same configurations and functions as those of the above-described embodiment are given the same reference numerals in the drawings, and thus, the repetitive description will be omitted.
[ apparatus for cutting electrode sheet according to second embodiment ]
As shown in fig. 5, in the apparatus 100' for cutting an electrode sheet according to the second embodiment of the present invention, the detection unit 120 is installed at the measurement point a. The apparatus 100' for cutting an electrode sheet further includes a regulating unit 140, and the regulating unit 140 is installed to be movable in a direction perpendicular to a conveying direction of the electrode sheet 10.
That is, the adjusting unit 140 may move the detecting unit 120 in a direction perpendicular to the conveying direction of the electrode sheet 10, and thus the position of the detecting unit 120 may be adjusted to correspond to the notch groove 11 passing through the measuring point a, thereby more accurately detecting the notch groove 11.
For example, the adjusting unit 140 may be installed at the measurement point a. A guide groove 141 may be formed in a top surface of the regulating unit 140 facing the electrode sheet 10 in a direction perpendicular to the conveying direction of the electrode sheet 10. Thus, the detection unit 120 is movably installed in the guide groove 141 so that the detection unit 120 moves in a direction perpendicular to the conveying direction of the electrode sheet 10.
As described above, the apparatus 100' for cutting an electrode sheet according to the second embodiment of the present invention may further include the adjustment unit 140. Thus, the position of the detection unit 120 may be adjusted according to the position of the notch groove 11 of the electrode sheet, so that electrode sheets having various sizes and shapes may be interchangeably used.
The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description and the exemplary embodiments described therein. Various modifications made within the claims of the invention and within the meaning of an equivalent of the claims are to be regarded as being within the scope of the invention.
Claims (8)
1. An apparatus for cutting an electrode sheet, the apparatus comprising:
a conveying unit that conveys an electrode sheet, which is formed with a plurality of notch grooves on a side surface thereof, up to a cutting point via a measurement point such that, when a notch groove provided at a leading end among the notch grooves formed in the electrode sheet passes the cutting point, a notch groove provided at a trailing end of the notch groove at the leading end passes the measurement point;
a detection unit provided at the measurement point to detect a notch groove of the electrode sheet passing through the measurement point, thereby generating a notch groove detection signal; and
a cutting unit disposed at the cutting point to cut an electrode sheet in which a notch groove passing through the cutting point is disposed according to the notch groove detection signal generated by the detection unit,
wherein the detection unit includes a line sensor installed in a direction perpendicular to a conveying direction of the electrode sheet to detect a notch groove of the electrode sheet passing through the measurement point to generate the notch groove detection signal,
wherein the line sensor includes a plurality of light receiving elements, and
the plurality of light receiving elements detect the notch grooves by a change in transmittance occurring when the notch grooves of the electrode sheet pass the measurement point,
wherein the notch grooves include a first notch groove and a second notch groove facing each other and formed at both side surfaces of the electrode sheet, respectively, and
the line sensor includes a first line sensor and a second line sensor to detect the first notch groove and the second notch groove.
2. The apparatus of claim 1, wherein the line sensor generates the notch groove detection signal even if any one of the first notch groove and the second notch groove is detected by the first line sensor and the second line sensor.
3. The apparatus of claim 1, wherein when both the first notch groove and the second notch groove are detected by the first line sensor and the second line sensor, the line sensor generates the notch groove detection signal according to an average of a time point at which the first notch groove is detected and a time point at which the second notch groove is detected.
4. The apparatus of claim 1, wherein the line sensor generates a notch groove defect signal when the first notch groove and the second notch groove are not detected by neither the first line sensor nor the second line sensor.
5. The apparatus according to claim 1, wherein an electrode tab is provided on one side surface of the electrode sheet on which the first notch groove is formed, and
the first line sensor detecting the first notch groove also detects whether the electrode tab is defective by a change in transmittance occurring when the electrode tab passes.
6. The apparatus of claim 1, wherein the detection unit is mounted at the measurement point, and
the apparatus further includes an adjustment unit installed to be movable in a direction perpendicular to a conveying direction of the electrode sheet such that a position of the detection unit is adjusted to correspond to a notch groove passing through the measurement point.
7. A method of cutting an electrode sheet using the apparatus of any one of claims 1 to 6, the method comprising:
a step (a) of continuously conveying an electrode sheet having a plurality of notch grooves formed in a side surface thereof to a cutting point via a measuring point by a conveying unit so that a notch groove provided at a rear end of a notch groove provided at a front end passes the measuring point when the notch groove provided at the front end among the notch grooves formed in the electrode sheet passes the cutting point;
detecting a notch groove of the electrode sheet passing through the measuring point, thereby generating a notch groove detection signal; and
and (c) cutting the electrode sheet, in which the notch groove passing through the cutting point is disposed, using a cutting unit to manufacture a unit electrode, when the notch groove detection signal is generated.
8. The method of claim 7, wherein said step (b) further comprises the steps of: with the detection unit, whether the electrode tab provided on one side surface of the electrode tab is defective is detected by a change in transmittance occurring when the electrode tab passes.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020180051716A KR102341464B1 (en) | 2018-05-04 | 2018-05-04 | Cutting device and method for electrode sheet |
| KR10-2018-0051716 | 2018-05-04 | ||
| PCT/KR2018/014640 WO2019212112A1 (en) | 2018-05-04 | 2018-11-26 | Electrode sheet cutting device and cutting method |
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| Publication Number | Publication Date |
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| CN110832676A CN110832676A (en) | 2020-02-21 |
| CN110832676B true CN110832676B (en) | 2022-09-16 |
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| CN201880043574.3A Active CN110832676B (en) | 2018-05-04 | 2018-11-26 | Device and method for cutting electrode slice |
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| Country | Link |
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| US (1) | US11597115B2 (en) |
| EP (1) | EP3633767B1 (en) |
| KR (1) | KR102341464B1 (en) |
| CN (1) | CN110832676B (en) |
| WO (1) | WO2019212112A1 (en) |
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Also Published As
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| US11597115B2 (en) | 2023-03-07 |
| EP3633767B1 (en) | 2023-09-06 |
| EP3633767A1 (en) | 2020-04-08 |
| KR102341464B1 (en) | 2021-12-22 |
| CN110832676A (en) | 2020-02-21 |
| WO2019212112A1 (en) | 2019-11-07 |
| EP3633767A4 (en) | 2020-08-19 |
| KR20190127283A (en) | 2019-11-13 |
| US20200139569A1 (en) | 2020-05-07 |
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